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Mineralpedia Details for Maricopaite

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Maricopaite

Maricopaite

Named for its type locality in the Moon Anchor mine in Maricopa County in Arizona, USA. Maricopaite occurs only at its type locality and is found in hydrothermal lead-copper ore veins as coating and filling fractures within quartz. Associated minerals include cerussite, mimetite, fornaceite, phoenicochroite, duftite, chrysocolla, wickenburgite, calcite, fluorite, and quartz.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/maricopaite.pdf

Formula
Ca2Pb7(Si36Al12)O99┬Ěn(H2O,OH) 
Crystal System
Orthorhombic 
Crystal Habit
Radial 
Cleavage
Imperfect, None, None 
Luster
Vitreous - Silky 
Color
white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Friable 
Hardness
1-1.5 
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Maricopaite from Moon Anchor mine, Maricopa Co., Arizona, United States

Maricopaite
            from Moon Anchor mine, Maricopa Co., Arizona, United States

Thin, white, silky splintery crystals to 2mm or more as singles and smaller, somewhat stellate groups to less than 1mm with associated orange Mimetite. Maricopaite is a zeolite-like mineral and has a structure closely related to Mordenite. Mineral data sites out there classify Maricopaite from a zeolite - Tektosilicate to a layered phyllosilicate. One locality mineral from a single quartz vein with other secondary minerals from arsenates, chromates, carbonates to silicates.

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